Table 7

Regression Analysis (Beta Coefficient Table) of Mortality-Related Factors for a Series of Elderly Patients Who Underwent Emergency Abdominal Surgery

Variable	Coefficient	Standard error	Standard coefficient	t-value	Probability
Intercept	0.333
Sex	0.046	0.028	0.056	1.63	0.103
Age	−0.032	0.028	−0.038	1.12	0.2618
American Society of Anesthesiologists grading	−0.142	0.017	−0.314	8.50	0.0001
Intestinal obstruction	0.036	0.038	0.043	0.93	0.3554
Peritonitis	0.044	0.042	0.049	1.06	0.2899
Gastrointestinal bleeding	0.117	0.076	0.062	1.54	0.1252
Mesenteric infarction	0.251	0.09	0.106	2.80	0.0053
Distant metastasis	0.034	0.066	0.02	0.52	0.6003
Time from onset of symptoms to hospital admission	−0.096	0.035	−0.116	2.70	0.0072
Time from hospital admission to surgery	−0.05	0.034	−0.055	1.46	0.1438
Time from onset of symptoms to surgery	0.031	0.041	0.033	0.75	0.4525
Gastrointestinal resection	0.036	0.038	0.035	0.95	0.3411
Intestinal bypass and defunctioning stoma	0.164	0.055	0.116	3.00	0.0028
Nontherapeutic laparotomy	0.232	0.063	0.138	3.66	0.0003
Suture of gastrointestinal perforation	0.073	0.058	0.049	1.26	0.2074